RR Telescopii
RR Telescopii is a symbiotic nova in the southern constellation Telescopium. It was recorded on photographic survey plates as a faint variable star between photographic magnitude (mpg) 9 to 16.6 from 1889 to 1944. In late 1944 the star began to brighten, increasing by about 7 magnitudes, from mpg ≈ 14 to brighter than 8. Brightening continued with a diminished rate of increase after early 1945, but the overall outburst was not noted until the star was seen at about 6.0, the threshold of naked eye brightness, in July 1948. At that time it was given the designation Nova Telescopii 1948. Since mid-1949 it has declined in brightness slowly, albeit accompanied by some remarkable changes in its spectrum, and as of August 2013 it had faded to visual magnitude around 12.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 20h 04m 18.538s |
| Declination | −55° 43′ 33.15″ |
| Apparent magnitude (V) | ≈12 (in 2013) |
| Characteristics | |
| Evolutionary stage | WN3-6.5+M3.5-7 |
| Variable type | Symbiotic nova |
| Astrometry | |
| Proper motion (μ) | RA: 3.342±0.305 mas/yr Dec.: −3.225±0.280 mas/yr |
| Distance | 2,700 pc |
| Details | |
| cool | |
| Mass | 0.9 M☉ |
| Radius | 457–518 R☉ |
| Luminosity | 7,350 - 9,450 L☉ |
| Temperature | 2,500 K |
| hot | |
| Radius | 0.08 R☉ |
| Luminosity | 3,500 - 9,000 L☉ |
| Surface gravity (log g) | 6.0 cgs |
| Temperature | 140,000 K |
| Other designations | |
| Database references | |
| SIMBAD | data |